DARPA announced that it is inviting proposals to tackle its latest project: Transformer X, a “vertical takeoff and landing roadable air vehicle” ready for testing by 2015.

It would have a maximum payload capacity of 1,000 pounds so that it can carry four passengers and their gear, be capable of flying itself automatically, achieving an altitude of 1,000 feet, and traveling 250 miles on a single tank of fuel.

The Terrafugia Transition roadable aircraft, tested last year, lacks autopilot and off-road features.